# Find Missing in Subtraction vs Planet Rotation

The clearest difference is price: Find Missing in Subtraction at Free against Planet Rotation's $0.99. Find Missing in Subtraction also leads on iOS requirement (10.0 vs 15.0). Planet Rotation's advantage is in-app purchases (none vs 1) and update cadence (every 10 months vs every 121 months). On ads and device support there is nothing between them.

Find Missing in Subtraction is free to download; Planet Rotation costs $0.99 up front. Find Missing in Subtraction sells 1 one-off in-app purchase. Planet Rotation asks for nothing beyond the download.

Find Missing in Subtraction ships an update every 121 months, Planet Rotation every 10 months. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Find Missing in Subtraction | Planet Rotation |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/find-missing-in-subtraction/id1078068895/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 121 months | **Every 10 months** |
| Monetization | Free | — |
| Size | 110 MB | 41 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blooming Kids Software LLC](https://appshunter.io/developer/501015942) | [Masahiro Tomosada](https://appshunter.io/developer/1587710118) |

## What reviewers say

### Find Missing in Subtraction

[App page](https://appshunter.io/ios/app/find-missing-in-subtraction/id1078068895)

This educational app helps children practice subtraction skills. It presents problems with missing numbers and offers interactive feedback. Users can customize settings like problem layout and number selection, and track progress through detailed reports.

**Highlights:** Interactive subtraction problems, Customizable problem layout (vertical/horizontal), Optional answer prompts, Random number generation, Congratulatory animations, Progress tracking and reports, Test mode

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Finding Missing Number in Subtraction | $3.99 | one-time |


### Planet Rotation

[App page](https://appshunter.io/ios/app/planet-rotation/id1604385250)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Find Missing in Subtraction free?

Find Missing in Subtraction is free to download, with in-app purchases available.

### Is Planet Rotation free?

Planet Rotation costs $0.99, with no in-app purchases.

### Do Find Missing in Subtraction or Planet Rotation have ads?

Neither Find Missing in Subtraction nor Planet Rotation shows ads.

### Which is updated more often, Find Missing in Subtraction or Planet Rotation?

Find Missing in Subtraction ships an update every 121 months, and Planet Rotation every 10 months. Most recently, Find Missing in Subtraction was updated on October 20, 2026 and Planet Rotation on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*